Info from Procharger:
Summary of 2004 Chevrolet Z06 Corvette Testing
Objective: Determine the operating temperature of the lubricating oil within a selfcontained automotive supercharger in various street driving conditions. Compare selfcontained lubricating oil operating temperature against engine oil operating temperature.
Description: A 2004 Chevrolet Corvette Z06 with ProCharger Stage II self-contained, intercooled supercharger system was driven through two street driving cycles. First, from a cold start the car was driven until warmed up then repeated wide open throttle acceleration runs were made (Figures 1 & 2). Next the car was parked for several hours
before being driven in a more conservative manner with 3 wide open throttle acceleration runs mixed in with steady freeway cruising (Figures 3 & 4). The vehicle was instrumented and an IO Tech Personal DAQ/56 USB data acquisition system and Vetronix Tech 2 diagnostic tester were used to observe and record the following parameters:
• Supercharger Inlet Temperature: Personal DAQ, K-type thermocouple inserted in the inlet tract of the supercharger.
• Supercharger Discharge Temperature: Personal DAQ, K-type thermocouple inserted in the discharge tube between the supercharger and the intercooler.
• Self-Contained Supercharger Oil Temperature: Personal DAQ, K-type
thermocouple inserted in the oil reservoir about ¼” offset from the slinger.
• Engine Oil Temperature: Tech 2, measured by the stock vehicle oil temperature sensor. This parameter is slightly different than ‘oil-fed supercharger oil temperature’ in that oil fed supercharger oil is taken from the engine oil and likely cools down 10oF - 15oF before being injected into the oil-fed supercharger.
• Engine Coolant Temperature: Tech 2, measured by the stock vehicle coolant temperature sensor.
• Vehicle Speed: Tech 2, measured by the stock vehicle speed sensor.
• Engine Speed: Tech 2, measured by the stock vehicle crank speed sensor.

Summary: Engine oil and self-contained supercharger oil start out at the same temperature and warm up at similar rates for the first 2 minutes from cold start. After 2 minutes the engine oil rapidly heats up to temperatures above 200oF while the selfcontained supercharger oil operates at temperatures between 105oF and 115oF (Figure 1).

Figure 1 also shows that the self-contained supercharger oil has reached a sort of equilibrium. Under high engine load the temperature increases and under low engine load the temperature decreases. This defines an operating temperature range for the selfcontained supercharger oil between 105oF and 115oF. The engine oil temperatures have not stabilized. Engine oil temperature rapidly increases under high load and holds steady or slowly increases under light load conditions. Thus the engine oil temperature has not reached equilibrium and its operating temperature is unknown but is well over 200oF. It should be noted that oil-fed superchargers typically use engine oil that has run through several feet of hose and this gives the oil an opportunity to cool down slightly before being injected into the oil-fed supercharger. Typically, a 10oF - 15oF drop in oil temperature is seen in an automotive application between the engine block and oil-fed
supercharger.

I copied this info from the porcharger link below. There are also charts in the link; especially note figure 3. Hope this helps.

Here's the link:
http://www.procharger.com/consumer_a...6_oil_temp.pdf
http://www.procharger.com/consumer_alert.shtml